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ABC, or the American Broadcasting Company, is the television network in the United States that airs Castle.
Broadcast History of Castle
The network aired Castle as a mid-season replacement beginning on March 9, 2009 after canceling many of the dramas that it aired at the beginning of the 2008-2009 season. After its first season run of 10 episodes, the network renewed it for a second season, initially for 13 episodes. As the 2009-2010 season progressed, and the show gathered a solid fan base, ABC extended its initial order to 22, then eventually to 24 episodes, giving it a full season run for its second season. After the conclusion of a two-part episode aired (Boom – (Part 2), episode 2.18), and the episode gave ABC it's highest ratings in the time slot in 14 years, the network renewed it for a third season, with an order of 22 episodes.
Since the premise of Castle is one where a world-famous murder mystery novelist shadows a New York City Police Department Homicide Detective, ABC released the novel Richard Castle writes on the show that features Nikki Heat, the character he based on Detective Kate Beckett, to the general public. After releasing one chapter at a time on ABC's website, Heat Wave was published in September, 2009 and spent over 20 weeks on the New York Times Bestseller List. The second Nikki Heat book, Naked Heat, was published on September 29, 2010, after also being released one chapter at a time on ABC's website, and jumped to #7 on the New York Times Bestseller List.
ABC also created a Twitter.com page for Richard Castle where fans of the show and the Nikki Heat books can follow him.